immediate display of text after entering the data in text box?

Hi,i have one text bo,when i enter the uder id in textbox,i want to display the name beside the textbox,how it is possible can any one help me?actually i have used ontextchanged event for this,but when i enter the userid in text box immeadiatly name is not displayed.when i clik the mose outside of the text box it is diaplying the name,but i want to display immediatly...like

if i enter 1002 as a userid in textbox,after entering last no 2,immeadiatly i want to display the name beside the textbox,can any one help me how it is possible?

actually i was displaying some payroll details based on this textbox(empid),so i have used ontext_changed event for this.and i put autopost back is true.when i use the update panel it is not working,can you please see this code,,,source code is...<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="paydescription.aspx.cs" Inherits="pay_description.paydescription" %>